October 2026 is bringing fresh investment into AI agents, autonomous coding tools, agent security, and the infrastructure needed to run AI-powered workflows. From general-purpose agents to specialized solutions for enterprise operations, startups are raising capital to build AI systems that can handle increasingly complex tasks.
This tracker covers publicly announced AI agent funding rounds in October 2026, including funding amounts, round details, announcement dates, investors, company categories, and locations. Companies are ranked by announced round size, from highest to lowest.
The tracker is updated as new funding announcements are verified. Where details such as lead investors, round type, or location have not been confirmed, this is noted in the company details.
| Company | Funding Amount | Round | Announced | Category | Location |
|---|---|---|---|---|---|
| Manus | $500M+ | Not specified | Oct 8, 2026 | General AI Agents | Unconfirmed |
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Company
Manus
Funding Details
More than $500 million raised. The formal round classification was not specified in the cited report.
Investors
See the original announcement for investor details.
Source
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| Armadin | $255.5M | Series B | Oct 1, 2026 | Agentic Security | Palo Alto, US |
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Company
Armadin
Funding Details
$255.5 million Series B to scale autonomous security capabilities.
Investors
Andreessen Horowitz and Accel.
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| Nous Research | $90M | Series B | Oct 7, 2026 | Open-Source AI Agents | US |
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Company
Nous Research
Funding Details
$90 million Series B to support the development of open-source AI models and agent technology.
Investors
Robot Ventures reportedly led the round, with participation reported from Nvidia, M12, Samsung, USV, and Menlo Ventures. Verify the final investor list against the original report.
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| doxx.net | $38M | Series A | Oct 1, 2026 | Agent Networking | Miami, US |
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Company
doxx.net
Funding Details
$38 million Series A, according to the cited funding tracker.
Investors
Andreessen Horowitz reportedly led the round.
Source
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| Vesta | $30M | Not specified | Oct 8, 2026 | Mortgage Agents | US |
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Company
Vesta
Funding Details
$30 million raised to support the adoption of AI agents by mortgage lenders. The formal round type was not specified in the cited report.
Investors
Conversion Capital reportedly led the round.
Source
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| Persona | $10M | Not specified | Oct 8, 2026 | Personal AI Agents | US |
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Company
Persona
Funding Details
$10 million raised for an AI assistant designed to work with a wearable band. The formal round type was not specified in the cited report.
Investors
Vine Ventures reportedly led the investment.
Source
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| Zeroset | $5.2M | Pre-seed | Oct 6, 2026 | Agent Memory Infrastructure | San Francisco, US |
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Company
Zeroset
Funding Details
$5.2 million pre-seed funding to develop memory infrastructure for AI agents.
Investors
Gradient Ventures and 2048 Ventures reportedly co-led the round.
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| Photon | $4.5M | Seed | Oct 1, 2026 | Agent Deployment | US |
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Company
Photon
Funding Details
$4.5 million seed funding to help replace traditional mobile apps with AI agents.
Investors
Gradient and A* reportedly co-led the round.
Source
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Note: Funding amounts and round details reflect the cited reports and may be updated as more information becomes available. Click any company row to view its details and source.